regime by means of the reduction in size and nurnber of spherical carbide particles around an inclusion according to the proposed mode 】 . New high speed steel was made experimentally by control the chemical compositions and evaluated with cantilever − type rotating bendiIlg fatigue tests . From the experimental results , fatigue crack initiation mQde charlged from large carbide in surface layer in low − cycle regime to matrjxcrack in surface in high − cycle regime , and subsurface − inclusion induced failure never appeared in VHCF regime , This behavier could be caused by decrease in distribution of small MC − carbide particles in the ma 仁 rix and restriction of the GBF area formation around a subsurface
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